400-051 Latest Exam (Aug 2018)

[Free] 2018(Aug) Ensurepass Cisco 400-051 Dumps with VCE and PDF 371-380

August 9, 2018

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CCIE Collaboration (v1.1)

Question No: 371 – (Topic 2)

Refer to the exhibit.

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Assuming that the administrator has never performed any manual custom uploads, which two file types can be found when you choose Software Upgrades, followed by TFTP File Management on the Cisco Unified Operating System Administration web page for Cisco Unified Communications Manager? (Choose two.)

  1. IP phone configuration files

  2. announcement audio files

  3. ringer files

  4. IP phone license files

  5. sample music-on-hold audio files

  6. softkey template files

Answer: B,C Explanation:

The two file types that we get are Announcement Audio Files and Ringer Files.

Topic 3, Telephony Standards and Protocols

Question No: 372 – (Topic 3)

: 43

Refer to the exhibit.

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Which SIP response message should the TGW send if it cannot process the tunneled QSIG messages from the OGW?

  1. 405 Method Not Allowed

  2. 406 Not Acceptable

  3. 412 Conditional Request Failed

  4. 415 Unsupported Media Type

  5. 485 Ambiguous

Answer: D Explanation:

Fallback from QSIG Tunneling

In some situations, QSIG tunneling will fail or need to fall back:

  • Remote party does not support multipart MIME body: In this case, the remote side sends a quot;415 Media Not Supportedquot; response. Upon receiving this response, OGW will fall back to normal mode and send an INVITE request without any tunneled content. This procedure helps ensure that at least the basic call will work normally.

  • Remote party does not understand tunneled content: If the remote side does not support the tunneled content, it should drop the tunneled content and continue as a normal call; because all essential parameters are present in the original INVITE, the call can go through without the need for fallback.

    ence: http://www.cisco.com/c/en/us/solutions/collateral/enterprise-networks/empowered- branch-solution/white_paper_c11_459092.html

    Question No: 373 – (Topic 3)

    Which two SCCP call signaling messages are initiated by Cisco Unified Communications Manager to an IP phone? (Choose two.)

    1. SoftKeyEvent

    2. CloseReceiveChannelAck

    3. CallState

    4. KeypadButton

    5. OpenReceiveChannel

    6. Offhook

    Answer: C,E Explanation:

    Upon receiving an OpenReceiveChannelmessage, the IP phone selects the UDP port number it wants to use to receive RTP packets and reports this information to call manager.

    With the SCCP protocol architecture, the majority of the H.323 processing power resides in an H.323 proxy – the Cisco CallManager. The end stations (IP phones) run the Skinny client, which consumes less processing overhead. The client communicates with CallManager using connection-oriented (TCP/IP-based) communication to establish a call with another H.323-compliant end station. Once Cisco CallManager has established the call, the two H.323 end stations use connectionless (UDP/IP-based) communication for audio transmissions.

    Question No: 374 – (Topic 3)

    Which two statements describe characteristics of Binary Floor Control Protocol? (Choose two.)

    1. Its binary encoding is designed to work in high-bandwidth environments.

    2. It is designed for audio or video conference sessions of three or more participants.

    3. It enables management of shared content resources independent of video streams.

    4. It supports TLS-based authentication.

    5. It supports SIP as well as H.323.

    Answer: C,D


    BFCP is a deliverable developed as part of the Internet Engineering Task Force (IETF) XCON Centralized Conferencing working group. The IETF XCON working group was formed to focus on delivering a standards-based approach to managing IP conferencing while promoting broad interoperability between software and equipment vendors.

    Question No: 375 – (Topic 3)

    Refer to the exhibit.

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    Which user agent has the recipient role in this SIP REFER call transfer?

    1. user agent A

    2. user agent B

    3. user agent C

    4. user agent B and C

    5. user agent A and B

    Answer: B


    The Refer method has three main roles:

  • Originator-User agent that initiates the transfer or Refer request.

  • Recipient-User agent that receives the Refer request and is transferred to the final- recipient.

  • Final-Recipient-User agent introduced into a call with the recipient.

  • Reference: http://www.cisco.com/c/en/us/td/docs/ios_xr_sw/iosxr_r3- 4/sbc/configuration/guide/sbc_c34/sbc34stx.pdf

    Question No: 376 – (Topic 3)

    What is the minimum number of H.225 messages required to establish an H.323 call with bidirectional media?

    1. 1

    2. 2

    3. 3

    4. 4

    5. 5

    Answer: B Explanation:

    A typical H.245 exchange looks similar to below figure

    After this exchange of messages, the two endpoints (EP) in this figure would be transmitting audio in each direction. The number of message exchanges is numerous, each has an important purpose, but nonetheless takes time.

    For this reason, H.323 version 2 (published in 1998) introduced a concept called Fast Connect, which enables a device to establish bi-directional media flows as part of the

    H.225.0 call establishment procedures. With Fast Connect, it is possible to establish a call with bi-directional media flowing with no more than two messages, like in figure 3.

    Fast Connect is widely supported in the industry. Even so, most devices still implement the complete H.245 exchange as shown above and perform that message exchange in parallel to other activities, so there is no noticeable delay to the calling or called party.

    Ensurepass 2018 PDF and VCE

    Question No: 377 – (Topic 3)

    To which SIP response category does 301 Moved Permanently belong?

    1. Provisional

    2. Successful

    3. Redirection

    4. Client Failure

    5. Server Failure

    Answer: C Explanation:

    The 301 response from the Web server should always include an alternative URL to which redirection should occur. If it does, a Web browser will immediately retry the alternative URL. So you never actually see a 301 error in a Web browser, unless perhaps you have a corrupt redirection chain e.g. URL A redirects to URL B which in turn redirects back to URL

    A. If your client is not a Web browser, it should behave in the same way as a Web browser

    i.e. immediately retry the alternative URL.

    Question No: 378 – (Topic 3)

    Which device is the initiator of a StationInit message in a Cisco Unified Communications Manager SDI trace?

    1. Cisco Unified Communications Manager

    2. MGCP gateway

    3. Cisco Music on Hold server

    4. SCCP IP phone

    5. SIP Proxy Server

    Answer: D Explanation:

    Station Init means that an inbound Transmission Control Protocol (TCP) message from a Skinny station reached CallManager. A Skinny station is any endpoint that uses the Skinny protocol to communicate with CallManager.

    Question No: 379 – (Topic 3)

    Which two responses are examples of client error responses in SIP protocol? (Choose two.)

    1. 302 Moved Temporarily

    2. 404 Not Found

    3. 503 Service Unavailable

    4. 502 Bad Gateway

    5. 604 Does Not Exist Anywhere

    6. 408 Request Timeout

    Answer: B,F Explanation:

    Client Error (400 to 499)-Request contains bad syntax or cannot be fulfilled at this server. This class of 400 to 499 contains only error messages.

    Question No: 380 – (Topic 3)

    Refer to the exhibit.

    Ensurepass 2018 PDF and VCE

    How many SIP signaling transaction(s) took place in this SIP message exchange between two SIP user agents?

    1. 1

    2. 2

    3. 3

    4. 4

    5. 5

    6. 6

    Answer: C Explanation:

    During the establishment, maintenance and termination of a SIP session, signaling

    messages are exchanged between the two SIP endpoints. There are two different kinds of signaling “conversations” that those messages take part in: transactions and dialogs.

    A transaction is a SIP message exchange between two user-agents that starts with a request and ends with its final response (it can also contain zero or more provisional responses in between). For example, during the termination of a SIP session, one user releases the call by sending a BYE request and the other party replies back with a 200 OK response. This message exchange is called a transaction.

    But what happens in the case of the INVITE request? The establishment of a SIP session starts basically with an INVITE request and is considered as completed upon the receipt of the ACK. In this case, the transaction starts with the INVITE request and ends with the 200 OK, so the ACK is not part of the transaction. The ACK can be considered as a transaction on its own. However, when the final response to an INVITE is not a 2xx response, then the ACK is considered as part of the transaction. A dialog is a complete exchange of SIP messages between two user-agents. That means that transactions are actually parts of a dialog. For example, in the case of a SIP session establishment, a dialog starts with the INVITE-200 OK transaction, continues with the ACK and ends with the BYE-200 OK transaction.

    The picture below depicts the dialog and transactions that take place during the establishment of a SIP session:

    Ensurepass 2018 PDF and VCE

    Note: There can also be subsequent requests that belong to the same dialog, such as a BYE or a re-INVITE message. As out-of-dialog requests are considered messages such as an initial INVITE request for a new session or an OPTIONS message for checking capabilities.

    There are different SIP headers/parameters that identify the dialogs and transactions, and they will be analyzed in later posts.

    Reference: https://telconotes.wordpress.com/2013/03/13/sip-transactions-vs-dialogs/

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